Installation - Mettler Toledo · 2020. 1. 28. · temperature coefficient set are appropriate for the sample being measured. 2. Measure sample Example Use auto endpoint or to freeze

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Installation1. Unpack the meter, power supply, this instruction

manual, electrodes, electrode arm, buffersachets, guide book and calibration certificate.Keep the calibration certificate in a safe place.

2. Check the power supply unit is the correctvoltage for your local supply. If it is not, contactyour distributor.

3. Attach the electrode arm to the left or righthandside of the meter:a. Turn the meter upside down and seat the

dome of the electrode arm base into the left orrighthand meter recess.

b. Insert and tighten the fixing screw.c. Turn the meter and base the right way up and

locate the electrode arm onto the base fixingpost. Press down to snap into place.

2Input and Output Connections

Rear Panel

power supplyunit socket

pH orcombinationelectrode socket

data outputsocket

referenceelectrodesocket

automatic temperaturecompensation probesocket

conductivitysensorsocket

titratoroutputsocket

1. Disconnect the shorting clip from the pH socketand retain it by clipping it over the socket.

2. Connect the electrode to the pH socket. If you areusing an electrode incorporating ATC connectthe other lead to the ATC socket.

3. If you are using a separate ATC probe for the pHchannel connect it to the ATC socket.

4. Connect conductivity sensor to the Sensor socket.5. Connect the power supply unit to the DC socket.

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DisplayspH/mV

automatic ormanualtemperaturecompensationindicator

electrodeconditionindicator

temperature,electrodeoffset/slope

memory, caland errornumber

datatransfericon

programmenuicons

stability/autoendpointindicator

maindisplay

automatictemperaturecompensationindicator

temperature memory, caland errornumber

datatransfericon

stability/autoendpointindicator

maindisplay

Conductivity/TDS

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places meter into standby mode/wakes meter up

starts/stops measurement• hold down for 2 seconds to reset sample ID number

starts calibration• hold down for 2 seconds to recall calibration data

selects pH or mV mode and deselects channel• hold down for 2 seconds to enter Program menu

stores result in memory. Increases value inProgram menu• hold down for 2 seconds to turn beeper on/off

recalls result from memory. Decreases valuein Program menu• hold down for 2 seconds to turn continuous

data transfer on/off

turns auto endpointing on/offA

Display Indicators

endpoint stability/auto endpoint

auto or manualtemp. compensation

continuous data transfer

Program Menu Indicators

time and date

manual temperature entry

buffer selection

cal reminder interval

MTCATC

MTC

Controls - pH/mV

Calibration Indicatorselectrode offset value electrode

conditionelectrode slope value

M

E0 mV

% slope

OnOff

Read

Cal

Mode

R

5

Controls - Conductivity/TDS

places meter into standby mode/wakes meter up

starts/stops measurement

starts calibration

selects conductivity or TDS mode anddeselects channel• hold down for 2 seconds to enter Program menu

stores result in memory. Increases value inProgram menu

recalls result from memory. Decreases value inProgram menu• hold down for 2 seconds to turn continuous

data transfer on/off

turns auto endpointing on/off

R

Display Indicators

endpoint stability/auto endpoint

auto temperature compensation

continuous data transfer

Program Menu Indicatorssolids factor(0.40 to 1.00)

reference temperature(20 or 25°C)temperature coefficient(0.0 to 10.0 %/°C)TDS units(mg/L or ppm)

mV output mode - titrator output(20.0µS, 200µS, 2.00 mS, 20.0 mS, 200 mSor t.op)

ATC

OnOff

P1

P2

P3

P4

Cal

Mode

A

M

Read

P5

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buffer

Calibrating - pHBefore commencing calibration it is essential thatyou read the following sections:

n Operating Hints

n Program Menu - pH/mV. Following theinstructions you will therefore have set the timeand date, manual temperature compensation (ifrequired), the correct buffer set, the order inwhich the buffers are prompted and thecalibration reminder interval.

n Endpointing a Reading. Set the auto endpointfeature if required.

1 point calibration1. Example

↓ 2 seconds

When you press Cal the pH buffer you selectedfor cal 1 (Program Menu) is displayed for2 seconds, and then the meter starts calibrating.

The meter will perform automatic bufferrecognition and therefore buffers can bepresented in any order. They will, however beprompted in the sequence setup in the programmenu.

2. If you are using auto endpoint the calibrationreading will freeze automatically when a stableendpoint is reached.Otherwise when the stability indicator

appears.Example display

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Calibrating - pH (continued)3. Rinse the electrode and blot dry

to return to sample measurement, orcontinue with step 4 for further cal points

2 or 3 point calibration4. Repeat steps 1, 2 and 3 using other buffers for a

2 point or 3 point calibration.

n Press Cal repeatedly to exit the calibration routine atany stage.

n When a calibration has endpointed you can press Modeto display the absolute mV value and temperature ofthe buffer. The display reverts to the buffer and E0values, or buffer and slope values for a 2 point or 3point calibration after 2 seconds.

Electrode Condition IndicatorThis indicator is displayed on a 2 point or 3 pointcalibration when the meter has endpointed and showsthe condition of the electrode at that time.

95.0 - 105.0% 90.0 - 94.9% 85.0 - 89.9%electrode in electrode electrodegood needs needscondition cleaning conditioning

8Calibrating - Conductivity/TDS

Before commencing this procedure it is essentialthat you read the following sections:

n Operating Hints

n Program Menu - Conductivity/TDS. Following theinstructions you will therefore have set the solidsfactor, reference temperature, temperaturecoefficient, TDS units and mV output mode -titrator output where appropriate.

n Endpointing a Reading. Set the auto endpointfeature if required.

1. Select conductivity or TDS mode

2. CalibrationExample

Use auto endpoint orto freeze the reading.

3. Repeat step 2 using conductivity standard.

If you wish to move straight to a first calibrationon conductivity standard, without first calibratingon air, press Cal twice.

4. Rinse the sensor

5. Press Read to return to sample measurement.

hold inair

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n If you press Mode to select pH or mV mode the meterbegins measuring immediately. You will not need topress Read to start the reading.

n The decimal point flashes during samplemeasurement. When the electrode outputhas stabilized the stability indicator appears.Manual endpoint - press Read to endpoint.Auto endpoint - the meter automatically endpoints.

n If you have the RS232 cable connected to the Datasocket, sample data is transmitted at endpoint.

Measuring Samples - pH/mV1. Select pH or mV mode

2. Measure sample

Use auto endpoint orto freeze the reading.

3. Rinse, blot and store the electrode.

103. Rinse the sensor

n If you press Mode to select conductivity or TDS modethe MPC227 begins measuring immediately. You willnot need to press Read to start the reading.

n The decimal point flashes during samplemeasurement. When the sensor outputhas stabilized the stability indicator appears.Manual endpoint - press Read to endpoint.Auto endpoint - the MPC227 automatically endpoints.

n If you have the RS232 cable connected to the Datasocket, sample data is transmitted at endpoint.sample

Measuring Samples - Conductivity/TDS

1. Select conductivity or TDS mode

Ensure that the solids factor andtemperature coefficient set areappropriate for the sample beingmeasured.

2. Measure sampleExample

Use auto endpoint orto freeze the reading.

Sensor PrecautionsCAUTION: To prevent static damage to theMPC227 always disconnect the conductivitysensor from the meter before cleaning thesensor.

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Operating Hintsn For greatest accuracy, standards and samples should

be at the same temperature.

n Do not use solutions after the expiry date.

n Always measure pH and conductivity separately.Results will be affected if both are measured at onetime in the same beaker.

pH/mVn Before using the electrode remove the wetting cap and

rubber fill hole cap (if fitted).

n Calibrate using buffers with values that bracket that ofthe sample. With a new pH electrode, or aftermaintenance, we recommend you use a buffer close topH 7 for the first calibration point.

n When you select the calibration buffers (ProgramMenu), set the buffer you will use most frequently for1-point calibrations as cal 1 and the one you will usemost frequently for the second calibration point ascal 2, and the one you will use most frequently for thethird calibration point as cal 3.

n When transferring the electrode from one solution toanother, rinse it with distilled water and blot dry withtissue paper - do not wipe the electrode as this maycause polarization and slow response.

n Correct storage of pH electrodes is very important.Consult the electrode manufacturer’s instructions foradvice.

Conductivity/TDSn When measuring, make sure the solution is above the

cell chamber slot.

n Make sure the cell chamber is free of bubbles whenmeasuring. To reduce air bubbles, immerse the sensorat an angle and then raise to the vertical position.

n Rinse sensor with next measurement sample betweenmeasurements, and ensure sensor is dried whenre-zeroing the instrument.

n For greatest accuracy, calibrate using a standard closein value to the sample.

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A

AR

RR

M

Endpointing a ReadingWhile the electrode is reading the decimal point willflash. Endpointing a reading can be achieved by:

Using Manual ModeThe meter will continue reading until the Read buttonis pressed to manually endpoint the reading. Duringreading the stability indicator may appear toshow that the meter recognises that a stableendpoint has been reached. Press Read to confirmthis endpoint and to freeze the display.

Using Auto EndpointIf this feature is used the display will freezeautomatically when a stable endpoint is reached and

will be displayed.To use this method press . The auto endpointindicator is displayed while the meter is reading.To turn off press again.A reading can be manually endpointed at any timein auto mode by pressing Read.

Using the MemoryEntering a Reading into MemoryYou can store 10 endpointed results for pH/mVand 10 for Conductivity/TDS.Press when the measurement has endpointed.M 1 is displayed (or M 2 to M 10 if readings havealready been stored). M 10 indicates the memory is full.

Recalling MemoryYou can only recall stored memories once thecurrent measurement has endpointed.Press - the last stored memory is displayed.Press to scroll through memories. RM 1 toRM 10 indicates which memory is being displayed.M 0 indicates no memories stored.

Clearing the MemoriesPress until M C is displayed.Press to clear the memories, M 0 indicates thememories have been cleared. (Press Read to exitwithout clearing the memories.)

M

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Using Continuous DataTransfer ModeIn continuous data transfer mode readings are sentto the data output approximately every second. Ifthe measurement endpoints (manually, or using autoendpoint) data transfer stops. If you recall memoriesall stored readings are output, (from the first to thelast stored).

To select continuous data transfer mode press andhold for 2 seconds.

n To maintain continuity of sample readingscalibration data is only output at endpoint.

n To send data from only one channel, deselect thechannel not required by pressing Mode.

R

Resetting Sample IDThe sample identity number is sent to the serialoutput and increments 1 every time a samplemeasurement endpoints.

To reset the sample ID number to 1, press and holdRead for 2 seconds. will be displayed, showingthat the number has been reset.

Recalling Calibration Data (pH only)You can only recall calibration data if the currentmeasurement has endpointed - press Read ifnecessary.

Press and hold Cal for 2 seconds. The display showsthe date and time of the last calibration, the buffervalue, the mV offset (E0) for 1-point calibrations, andthe slope value (%) for 2 (3) point calibrations.

14Manual Temperature CompensationYou can enter temperature manuallybetween –5.0 and 105.0°C. (An ATC probewill override manual compensation.) Themeters have a preset temperature of 25°C.Use and to change temperature. PressMode to enter the value and move on.

pH Buffer SelectionThe buffers are grouped in sets(b = 1, b = 2, b = 3); select your requiredset first using and :set 1 = 7.00, 4.00, 10.01, 1.68set 2 = 7.00, 4.01, 9.21, 2.00, 11.00set 3 = 6.87, 4.01, 9.18, 1.68Press Mode to enter the set and move on.NOTE: Check that the correct buffer set isselected in order to use the buffers supplied,i.e. set 1 in the United States, set 2 in Europeor set 3 in all other countries.

Program Menu - pH/mVThe Program Menu allows you to set manualtemperature compensation, pH calibration buffers,calibration reminder and date and time.You can only enter the Program Menu if the currentmeasurement has endpointed - press Read if necessary.Press and hold the Mode key for 2 seconds to accessthe Program Menu - appears.Press Mode to scroll through the options and pressand to change the value. Press Read to exit theProgram Menu at any time. If you press Read when avalue is flashing that value will not be entered.

Time and DateTime and date are displayed duringcalibration recall, and will be sent to theserial output. Time is shown on the maindisplay, the date is shown on the lower partof the display. Set the time and date using

and . Press Mode to enter the value andmove on.

R

RM

MTC

M

R

RM

M

15

RM

Program Menu - pH/mV (continued)Choose three buffers (cal 1, cal 2, cal 3)from the set for calibration. For ease of use,set the buffers in the order that you will usethem.The factory settings can be rearranged inany order using and . Press Mode toenter the value and move on.

Calibration ReminderThe calibration reminder interval can be set,in hours, between 0 and 99 (where0 = no reminder). When the selected timehas elapsed the calibration reminder symbolwill appear.

The MPC227 has a preset reminder intervalof 1 hour. Change the interval using and

. Press Mode to enter the value and moveon.

Press Read to exit the Program Menu.

RM

cal 1cal 2cal 3

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M R

M R

Reference TemperatureThe temperature to which measurementsare referenced can be set to 20 or 25°C. TheMPC227 has a preset reference temperatureof 25°C. Change the temperature usingand . Press Mode to enter the value andmove on.Temperature CoefficientConductivity measurements change withtemperature. The temperature coefficient(%/°C) is a measure of this change and canbe set between 0.0 and 10.0, as appropriatefor the sample being measured. Adjustingthe temperature coefficient affects theinstrument temperature range - refer tosection on specifications for details. TheMPC227 has a preset temperaturecoefficient of 2.0°C. Change the coefficientusing and . Press Mode to enter thevalue and move on.

Program Menu - Conductivity/TDSThe Program Menu allows you to set solids factor;reference temperature; temperature coefficient andTDS units.You can only enter the Program Menu if the currentmeasurement has endpointed - press Read ifnecessary.Press and hold the Mode key for 2 seconds to accessthe Program Menu - appears.Press Mode to scroll through the options and press

and to change the value. Press Read to exit theProgram Menu at any time. If you press Read when avalue is flashing that value will not be entered.

Solids FactorThe solids factor is the ratio of TDS (ppm ormg/L) to conductivity (µS/cm) and can beset between 0.40 and 1.00. The MPC227 hasa preset solids factor of 0.50. Change thevalue using and . Press Mode to enterthe value and move on.

P1

P2

P3

RM

RM

17

P4

Program Menu - Conductivity/TDS (continued)TDS UnitsTDS can be measured in mg/L or ppm. (TheMPC227 auto ranges to g/L or ppt). Changethe units using and . Press Mode toenter the units and move on.mV Output Mode - Titrator OutputThe millivolt output range is selected bysetting the mid point of the conductivityrange required. The selectable mid pointsare 20.0µS, 200µS, 2.00 mS, 20.0 mS,200 mS and t.op, and the millivolt values forthe whole meter range are:Mid point Measurement ranges

18 - 180 mV 180 - 1800 mV20µS 2µS - 20µS 20µS - 200µS200µS 20µS - 200µS 200µS - 2 mS2 mS 200µS - 2 mS 2 mS - 20 mS20 mS 2 mS - 20 mS 20 mS - 200 mS200 mS 20 mS - 200 mS 200 mS - 1000 mS (900 mV)

P5

When the conductivity level falls outside therange set, the meter will output at theminimum or maximum point of that range,whichever is closer.

The meter can be set to output millivoltvalues for the whole meter range. Thisoption is selectable when the displaysshows t.op and the millivolt output valuesare:Measurement ranges mV output ranges1µS - 10µS 0 - 300 mV10µS - 100µS 300 - 600 mV100µS - 1 mS 600 - 900 mV1 mS - 10 mS 900 - 1200 mV10 mS - 100 mS 1200 mV - 1500 mV100 mS - 1000 mS 1500 mV - 1800 mV

Change the mid point using and .Press Mode to enter the mid point and moveon.

Press Read to exit the Program Menu.

RM

M R

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protective ground (0V)

signal transmitCTS

5 1

9 6

InterfacingSerial OutputThe MPC227 can interface with computers andMettler Toledo printers, Acquire Data Acquisitionsoftware and other RS232 compatible devices viathe RS232 cable. Contact your supplier for a list ofcompatible printers. The maximum source or sinkcurrent available is ± 10mA.Pin Signal Pin Signal1 device enable (link to pin 5) 6 not used2 RS232 Tx (signal transmit) 7 not used3 not used 8 not used4 CTS (clear to send) 9 not used5 protective ground (0V)

Data Socket

Type of communication - uni directional, baudrate 2400, data format - 7 data bits : 1 stop bit : evenparity

n Data is sent to the Data socket at measurementendpoint (manual or automatic), calibration recall andmemory recall.

n To use the output to monitor continually, you need toselect continuous data transfer mode.

Titrator OutputOutput voltage is dependent on the range selectedand is set by selecting the mid point of the outputrange required. For further information refer to thesection on Program Menu - Conductivity/TDS.

data output

0V

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Problem Solving - pH/mVErr 1 - offset value (E0) out of rangeCheck correct buffer is used.Check mV reading for pH 7 buffer is 0 ± 35 mV. If itis not, clean or replace the electrode.

Err 2 - slope out of range

Slope less than 85%, or not calculable.Electrode needs cleaning, conditioning orreplacing. Check correct buffers are used.

Slope more than 105.0%.Check calibration buffers.

NOTE: Where 0 mV/pH unit = 0%, and59.16 mV/pH unit = 100% (at 25°C)

Err 3 - pH buffer outside temperature limitspH buffers must be between 5°C and 50°C foraccurate calibration.

. Displayed (out of range)Check electrode is connected and immersed insample. Check wetting cap is removed.

Data Entry ErrorsDate flashes and reverts to previous setting - invaliddate entered.

Entered temperature value changes to –5.0 or105.0 - the meter will not accept values outside thisrange.

Dashes displayed instead of buffer value duringcalibration buffer set up - that buffer has alreadybeen selected for a cal point. Cal points must havedifferent values.

20Problem Solving - Conductivity/TDS +Err 1 - measurement out of rangeCheck sensor is connected and immersed in sample.Err 2 - cal 1 out of rangeClean the sensor, or replace.Err 3 - cal 2 out of rangeCheck correct standard is being used.Check correct solids factor is being used - forMettler Toledo standards use the following factors1413 µS/cm factor 0.53 12.88 mS/cm factor 0.58Clean the sensor, or replace.

Data Entry ErrorsEntered solids factor value changes to 0.40 or 1.00 - theMPC227 will not accept solids factors outside this range.Entered temperature coefficient value changes to0.0 or 10.0 - the MPC227 will not accept temperaturecoefficients outside this range.If MTC is displayed, check connection to sensor/replace sensor.

MaintenanceThere are no user replaceable parts in the meter orpower supply unit. Do not remove the cover.

The meter requires very little maintenance.Occasionally wipe the meter with a damp cloth. Thecasework is made of ABS/PC which is known to beaffected by some organic solvents, includingtoluene, xylene and methyl-ethyl-ketone. It is goodpractice to wipe away any spillages as soon as theyoccur.

Electrode MaintenanceRefer to the electrode product insert for full detailson maintaining your electrode.

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Spares and Accessories51302118 Electrode Arm and Base51302125 RS232 Cable00229170 GA42 Printer00229119 LC - P45 GLP Printer

pH/mV52000100 InLab 413 ‘3 in 1’ pH Electrode52000118 InLab 410 pH Electrode51300164 30KΩ NTC Probe51302258 Conductivity to Titrator Cable51300047 Guide to pH Measurement51302069 pH 4.01 Buffer Sachets, 30/pack51302047 pH 7.00 Buffer Sachets, 30/pack51302070 pH 9.21 Buffer Sachets, 30/pack51302068 Rainbow Pack Buffer Sachets

(10 each of pH 4.01, 7.00 and 9.21)51340058 pH 4.01 Buffer Solution, 250 mL x 651340060 pH 7.00 Buffer Solution, 250 mL x 651300194 pH 9.21 Buffer Solution, 250 mL x 6

Conductivity/TDS51302119 4-Plate Carbon Conductivity Sensor51302255 2-Plate Glass Conductivity Sensor51302256 4-Plate Glass Conductivity Sensor51302275 Glass Flow-Through Cell51724716 Guide to Conductivity and Dissolved Oxygen

Measurements51302050 12.88 mS/cm Conductivity Standard Sachets,

30/pack51302049 1413 µS/cm Conductivity Standard Sachets,

30/pack51300139 12.88 mS/cm Conductivity Standard Bottle,

500 mL51300138 1413 µS/cm Conductivity Standard Bottle,

500 mL

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1.68 2.00 4.00 4.01 6.87 7.00 9.18 9.21 10.01 11.005°C 1.67 2.02 4.00 4.01 6.95 7.09 9.40 9.45 10.25 11.72

10°C 1.67 2.01 4.00 4.00 6.92 7.06 9.33 9.38 10.18 11.5415°C 1.67 2.00 4.00 4.00 6.90 7.04 9.28 9.32 10.12 11.3620°C 1.68 2.00 4.00 4.00 6.88 7.02 9.23 9.26 10.06 11.1825°C 1.68 2.00 4.00 4.01 6.87 7.00 9.18 9.21 10.01 11.0030°C 1.68 1.99 4.01 4.01 6.85 6.99 9.14 9.16 9.97 10.8235°C 1.69 1.99 4.02 4.02 6.84 6.98 9.10 9.11 9.93 10.6440°C 1.69 1.98 4.03 4.03 6.84 6.97 9.07 9.06 9.89 10.4645°C 1.70 1.98 4.04 4.04 6.83 6.97 9.04 9.03 9.86 10.2850°C 1.71 1.98 4.06 4.06 6.83 6.97 9.01 8.99 9.83 10.10

Buffer TablesThe MPC227 automatically corrects pH buffers for temperature using the values shown in the table.

Refer to the section: Program Menu - pH/mV Mode, under pH Buffer Selection to select.

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SpecificationsMeasurement pH 0.00 to 14.00Ranges mV ± 1999 mV

Cond. 0.00 to 1000 mS/cmTDS 0.00 to 1000 g/L

Resolution pH 0.01mV 1Temp. 0.1Cond. variableTDS variable

Relative Accuracy* pH ± 0.01 Cond. ± 0.5%**mV ± 1 mV TDS ± 0.5%**Temp. ± 0.4°C Temp. ± 0.4°C

pHIsopotential Point pH 7.00Calibration Points pH 3 of 3

Input Conditions Impedance>1012 ohms

Temp. Compensation –5.0 to 105.0°Cauto/manual

ConductivityTemp. Compensation 0.0 to 80.0°C (ATC) - set by

the value of the temperaturecoefficient

Auto Calibration Points Zero and:84 µS/cm, 1413 µS/cm,12.88 mS/cm or 80 mS/cm

Solids Factor 0.40 to 1.00, selectable

Reference Temperature 20/25°C, selectableTemperature Coefficient 0.0 to 10.0%/°C, selectable

Instrument temperature range as adjusted by temp.coefficient: 0.0 - 2.0% = 0 - 80°C

2.0 - 3.0% = 0 - 60°C3.0 - 4.0% = 0 - 50°C4.0 - 7.0% = 0 - 40°C

* ± 1 least significant digit** 0 - 200mS: ± 0.5% of range being measured

200mS - 1000mS: ± 0.5% of range being measured or0.15 ohms, whichever is the greater

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Memory - pH/mV 10 memoriesConductivity 10 memories

Outputs Titrator (Conductivity)Serial

Display LCDOperating Conditions

Temperature 5 to 40°CHumidity at 35°C (non condensing) max. 85%Installation Category 2Pollution Category Degree 2

Size inches 101/2 x 71/2 x 21/2mm 265 x 190 x 65

Weight lb 2.2kg 1.0

Power RequirementsThe MPC227 is supplied with an appropriate powersupply unit.USA/Japan 100 - 120V, 50/60Hz, 0.85VAEurope 230V, 50Hz, 1.1VAOutput from PSU: 9V DCMeter Power Rating: 0.6VA

NOTE: The meter should only be used with the powersupply unit supplied.

Specifications (continued)